Application of 12 potential evapotranspiration estimation methods under changing environments in different arid and humid regions
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Abstract:
Taking the International Food and Agriculture Organization(FAO) Penman-Monteith method(P-M method) as a benchmark, the study area is divided into 5 arid and humid regions based on humidity. From the four aspects of correlation, multi-year average, spatial distribution within the year, and parameter charact eristics, and 12 potential evaprtranspiration methods, including temperature method, mass transfer method, and radiation method, it is deeply divided into three types. The applicability of the estimat ion method was carried out in different climate zones in 31 provinces(aur tonomous regions and municipalities) in China. The results show that: with in the research area, the monthly correlation, and multi-year average potential eva potranspiration value between radiatior based methods and the P-M method is significantly better than tem perature based methods and mass-transfer-based methods, among them, the P-T method has the best estimation effect while the Hamon method has the worst; for different arid and humid regions, the correlation between temperature based methods and P-M method,mass-transfer-based methods, and P-M method is better in arid regions than in humid regions; the potential evapotranspiration estimated by the Penman method is closest to that calculated by the P-M method in arid regions; radiation-based-methods (excluding the Jensen method) are better than tem perature-based methods and mass-transfer-based methods in different arid and humid regions, rohwer method has the best annual distribution in all arid and humid regions.The Abtew method is the best in arid regions. PT,M ak, Harg, and Door metrods are best in humid regions,while the Jensen and Kharrufa methods are the worst in all arid and humid regions. Taken together, the radiation method performs best in the research area,when the study area is humid, temperature-based methods and mass-transfer- based methods are selected, if the study area is arid, Penman and A btew methods may be preferred.
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